NATE AC Service Certification Questions and Answers

NATE AC Service Certification Questions and Answers 1. A system is supplied from the factory with charge of 5 pounds 10 ounces for a 15 foot line set. The line set is 25 feet long. The manufacturer's instruction sheet specifies 0.6 ounces of refrigeration to be added for each added foot of refrigerant line set length. What is the total refrigerant charge for the system? A. 6 ounces B. 5 pounds C. 5 pounds 10 ounces D. 6 pounds: Ans:D. 6 pounds 15ft - 25ft = 10ft x .6 = 6 ounces 5 pounds + 10 ounces + 6 ounces 5 pounds + 16 ounces = 6 pounds 2. The purpose of using flux when soldering is to: A. anneal the surface. B. give better heat flow. C. reduce oxidation. D. pre-seal the oxidation.: Ans:C. reduce oxidation. 3. Outdoor condensing units that are installed in areas where flooding is possible must: A. be mounted above flood level. B. utilize NEMA 1 enclosures. C. be mounted under an overhanging eave. D. use water resistant components.: Ans:A. be mounted above flood level.